diff --git a/src/calibre/gui2/convert/heuristics.ui b/src/calibre/gui2/convert/heuristics.ui
index c121fd203e..2d7cae9b60 100644
--- a/src/calibre/gui2/convert/heuristics.ui
+++ b/src/calibre/gui2/convert/heuristics.ui
@@ -210,19 +210,6 @@
         </property>
        </widget>
       </item>
-      <item>
-       <spacer name="verticalSpacer">
-        <property name="orientation">
-         <enum>Qt::Vertical</enum>
-        </property>
-        <property name="sizeHint" stdset="0">
-         <size>
-          <width>131</width>
-          <height>35</height>
-         </size>
-        </property>
-       </spacer>
-      </item>
      </layout>
     </widget>
    </item>